| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inner frame of a floor opening structure, which stably fits to a cover plate without allowing the size to be enlarged. <P>SOLUTION: An extension part 45 connects to at least one of a frame side part 42, a frame lower part 43, and a frame upper part 44, has an opposing face 451 opposed to an inside surface 421 of the frame side part 42 in the thickness direction of the frame side part 42, and holds a first projection 25 between the opposing face 451 and the inside surface 421 of the frame side part 42 in the thickness direction. A groove part 46 is disposed on the top face of the frame lower part 43, has a bottom face 461 on which a second projection 26 is to be placed, and holds the second projection 26 between the bottom face 461 and an undersurface 811 of a cover plate 81 in vertical direction. <P>COPYRIGHT: (C)2012,JPO&INPIT |
